Hartzell Propeller Airworthiness Directive

Hartzell Propeller Airworthiness Directive

SUMMARY: The FAA is superseding an existing airworthiness directive (AD) for all Hartzell Propeller Inc.models ( ) HC-( )( )Y( )-( )( )( ) compact series, constant speed or feathering propellers with Hartzell manufactured ''Y'' shank aluminum blades. That AD currently requires initial bladeinspections, with no repetitive inspections; rework of all ''Y'' shank aluminum blades includingcold rolling of the blade shank retention radius, blade replacement and modification of pitch change mechanisms for certain propeller models; and changing the airplane operating limitations with specific models of propellers installed. This AD requires the same actions but clarifies certain areas of the compliance, and updates a certain service bulletin (SB) reference to the most recent SB. This AD results from operators requesting clarification of certain portions of AD 2002-09-08 .We are issuing this AD to prevent failure of the propeller blade from fatigue cracks in the blade shank radius, which can result in damage to the airplane and loss of airplane control.